mirror of
https://github.com/FFmpeg/FFmpeg.git
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227 lines
6.6 KiB
C
227 lines
6.6 KiB
C
/*
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* Dxtory decoder
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*
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* Copyright (c) 2011 Konstantin Shishkov
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#define BITSTREAM_READER_LE
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#include "avcodec.h"
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#include "bytestream.h"
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#include "get_bits.h"
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#include "internal.h"
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#include "unary.h"
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#include "libavutil/common.h"
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#include "libavutil/intreadwrite.h"
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static int dxtory_decode_v1(AVCodecContext *avctx, AVFrame *pic,
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const uint8_t *src, int src_size)
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{
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int h, w;
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uint8_t *Y1, *Y2, *U, *V;
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int ret;
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if (src_size < avctx->width * avctx->height * 3 / 2) {
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av_log(avctx, AV_LOG_ERROR, "packet too small\n");
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return AVERROR_INVALIDDATA;
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}
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avctx->pix_fmt = AV_PIX_FMT_YUV420P;
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if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
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return ret;
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Y1 = pic->data[0];
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Y2 = pic->data[0] + pic->linesize[0];
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U = pic->data[1];
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V = pic->data[2];
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for (h = 0; h < avctx->height; h += 2) {
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for (w = 0; w < avctx->width; w += 2) {
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AV_COPY16(Y1 + w, src);
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AV_COPY16(Y2 + w, src + 2);
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U[w >> 1] = src[4] + 0x80;
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V[w >> 1] = src[5] + 0x80;
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src += 6;
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}
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Y1 += pic->linesize[0] << 1;
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Y2 += pic->linesize[0] << 1;
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U += pic->linesize[1];
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V += pic->linesize[2];
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}
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return 0;
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}
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static const uint8_t def_lru[8] = { 0x00, 0x20, 0x40, 0x60, 0x80, 0xA0, 0xC0, 0xFF };
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static inline uint8_t decode_sym(GetBitContext *gb, uint8_t lru[8])
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{
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uint8_t c, val;
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c = get_unary(gb, 0, 8);
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if (!c) {
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val = get_bits(gb, 8);
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memmove(lru + 1, lru, sizeof(*lru) * (8 - 1));
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} else {
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val = lru[c - 1];
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memmove(lru + 1, lru, sizeof(*lru) * (c - 1));
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}
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lru[0] = val;
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return val;
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}
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static int dx2_decode_slice(GetBitContext *gb, int width, int height,
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uint8_t *Y, uint8_t *U, uint8_t *V,
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int ystride, int ustride, int vstride)
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{
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int x, y, i;
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uint8_t lru[3][8];
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for (i = 0; i < 3; i++)
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memcpy(lru[i], def_lru, 8 * sizeof(*def_lru));
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for (y = 0; y < height; y+=2) {
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for (x = 0; x < width; x += 2) {
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Y[x + 0 + 0 * ystride] = decode_sym(gb, lru[0]);
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Y[x + 1 + 0 * ystride] = decode_sym(gb, lru[0]);
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Y[x + 0 + 1 * ystride] = decode_sym(gb, lru[0]);
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Y[x + 1 + 1 * ystride] = decode_sym(gb, lru[0]);
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U[x >> 1] = decode_sym(gb, lru[1]) ^ 0x80;
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V[x >> 1] = decode_sym(gb, lru[2]) ^ 0x80;
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}
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Y += ystride << 1;
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U += ustride;
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V += vstride;
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}
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return 0;
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}
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static int dxtory_decode_v2(AVCodecContext *avctx, AVFrame *pic,
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const uint8_t *src, int src_size)
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{
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GetByteContext gb;
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GetBitContext gb2;
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int nslices, slice, slice_height;
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uint32_t off, slice_size;
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uint8_t *Y, *U, *V;
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int ret;
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bytestream2_init(&gb, src, src_size);
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nslices = bytestream2_get_le16(&gb);
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off = FFALIGN(nslices * 4 + 2, 16);
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if (src_size < off) {
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av_log(avctx, AV_LOG_ERROR, "no slice data\n");
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return AVERROR_INVALIDDATA;
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}
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if (!nslices || avctx->height % nslices) {
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avpriv_request_sample(avctx, "%d slices for %dx%d", nslices,
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avctx->width, avctx->height);
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return AVERROR(ENOSYS);
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}
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slice_height = avctx->height / nslices;
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if ((avctx->width & 1) || (slice_height & 1)) {
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avpriv_request_sample(avctx, "slice dimensions %dx%d",
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avctx->width, slice_height);
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}
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avctx->pix_fmt = AV_PIX_FMT_YUV420P;
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if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
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return ret;
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Y = pic->data[0];
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U = pic->data[1];
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V = pic->data[2];
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for (slice = 0; slice < nslices; slice++) {
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slice_size = bytestream2_get_le32(&gb);
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if (slice_size > src_size - off) {
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av_log(avctx, AV_LOG_ERROR,
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"invalid slice size %d (only %d bytes left)\n",
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slice_size, src_size - off);
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return AVERROR_INVALIDDATA;
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}
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if (slice_size <= 16) {
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av_log(avctx, AV_LOG_ERROR, "invalid slice size %d\n", slice_size);
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return AVERROR_INVALIDDATA;
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}
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if (AV_RL32(src + off) != slice_size - 16) {
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av_log(avctx, AV_LOG_ERROR,
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"Slice sizes mismatch: got %d instead of %d\n",
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AV_RL32(src + off), slice_size - 16);
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}
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init_get_bits(&gb2, src + off + 16, (slice_size - 16) * 8);
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dx2_decode_slice(&gb2, avctx->width, slice_height, Y, U, V,
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pic->linesize[0], pic->linesize[1], pic->linesize[2]);
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Y += pic->linesize[0] * slice_height;
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U += pic->linesize[1] * (slice_height >> 1);
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V += pic->linesize[2] * (slice_height >> 1);
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off += slice_size;
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}
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return 0;
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}
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static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
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AVPacket *avpkt)
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{
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AVFrame *pic = data;
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const uint8_t *src = avpkt->data;
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int ret;
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if (avpkt->size < 16) {
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av_log(avctx, AV_LOG_ERROR, "packet too small\n");
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return AVERROR_INVALIDDATA;
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}
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switch (AV_RB32(src)) {
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case 0x02000001:
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ret = dxtory_decode_v1(avctx, pic, src + 16, avpkt->size - 16);
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break;
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case 0x02000009:
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ret = dxtory_decode_v2(avctx, pic, src + 16, avpkt->size - 16);
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break;
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default:
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avpriv_request_sample(avctx, "Frame header %X", AV_RB32(src));
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return AVERROR_PATCHWELCOME;
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}
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if (ret)
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return ret;
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pic->pict_type = AV_PICTURE_TYPE_I;
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pic->key_frame = 1;
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*got_frame = 1;
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return avpkt->size;
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}
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AVCodec ff_dxtory_decoder = {
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.name = "dxtory",
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.long_name = NULL_IF_CONFIG_SMALL("Dxtory"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_DXTORY,
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.decode = decode_frame,
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.capabilities = CODEC_CAP_DR1,
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};
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